`input` assumes the last character is a '\n' and always strips it

Bug report

Bug description:

When reading from the tty python's builtin input function assumes that the last character read is a newline and proceed to strip it out leading to missing input.

Current behaviour:

$ ./python -c 'print(repr(input()))'
abc'ab'

Expected behaviour:

$ ./python -c 'print(repr(input()))'
abc'abc'

CPython versions tested on:

3.14, 3.13, CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-149237

使用提供的 ./python -c 輸入命令重現問題，然後檢查 CPython 的 builtin input 實作以及相關的 PR gh-149237。當讀取的資料不以換行符號結尾時，tty 輸入不再遺失最後一個字元，且相關測試通過，即表示完成。